Hi,
You did not mention about your what is the exact treatment going on. Well if your hormone balance and pcos problems are not there, then you can surely start diet, exercise n a lifestyle modification regime.
Next Steps
You have to take care of your stress n sleep too. Hence check on that. Avoid carbs n sweets, have small gaps between meals. Keep yourself hydrated, have green tea at least once. Exercise daily including cardio, n some relaxing yoga.
You can get in touch with any dietician around you. Also you can contact me, since I am too from Delhi.